What temperature range should the room be for proper operation?

The unit should be operated with an indoor side temperature range of 60°F to 90°F (16°C to 32°C) and an outdoor side temperature range of 64°F to 109°F (18°C to 43°C). Performance may be reduced outside of these operating temperatures.

From the official Frigidaire FHWC054TE1 Window Air Conditioner manual, page 19

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